What does "permeation" indicate concerning hazardous materials?

Permeation refers to the process by which hazardous materials, particularly in vapor or liquid form, penetrate protective materials at a molecular level. This means that even if a protective barrier appears intact, hazardous substances can still diffuse through it. Understanding permeation is crucial for selecting appropriate protective clothing and gear, as it underscores the need for materials that can resist chemical penetration, particularly when dealing with potentially toxic or harmful substances. The significance of recognizing permeation is vital for ensuring that firefighters and hazmat responders are adequately protected while performing their duties around hazardous materials.